Letterman scores highest rating since 2005

May 21, 2015 7:30 PM

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David Letterman's final appearance as host of "The Late Show" delivered the CBS program's best overnight rating since December 2005, when Oprah Winfrey was a guest.

Based on the overnight data from the top 56 markets measured by Nielsen, the 90-minute farewell averaged a 9.3 rating and a 24 share - higher than any prime-time show that aired on the night. That's more than four times the 2.2 rating "The Late Show" has averaged for the 2014-15 season.